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Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years.

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. If a TV manufacturer wants to provide a warrenty so that only 1% of the TV sets will be replaced before warrenty expires, what is the length of time of the warrenty?

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